<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script src="../js/vue.js"></script>
    <div id="app">
        <h2>当前计数:{{counter}}</h2>
        <button @click='counter++'>+</button>
        <button @click='counter--'>-</button>

        <button v-on:click='add'>+</button>
        <button v-on:click='sub'>-</button>
    </div>

    <script>
        const app = new Vue({
          el:'#app',
            data:{
                counter:0
            },
            methods:{
              add:function(){
                    this.counter++
                },
                sub:function(){
                    this.counter--
                }
            }
        })
    </script>
</body>
</html>